-2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 <= sender@testhost.test.ex U=sender P=local S=sss for a@test.ex
-2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 => a@test.ex R=to_server T=remote_smtp_dkim H=127.0.0.1 [127.0.0.1] K C="250- 6nn byte chunk, total 6nn\\n250 OK id=10HmaY-000000005vi-0000"
+2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 <= sender@testhost.test.ex U=sender Ci=p1234 P=local S=sss for a@test.ex
+2017-07-30 18:51:05.712 10HmaX-000000005vi-0000 => a@test.ex R=to_server T=remote_smtp_dkim H=127.0.0.1 [127.0.0.1] K DKIM=test.ex:sel C="250- 6nn byte chunk, total 6nn\\n250 OK id=10HmaY-000000005vi-0000"